var Something = {
    cool: function () {
        this.greeting = "Hello World";
        this.count = this.count ? this.count + 1 : 1;
    }
};
Something.cool();
console.log(Something.greeting); // "Hello World"
console.log(Something.count); // 1
var Another = {
    cool: function () {
        // 隐式把 Something 混入 Another
        Something.cool.call(this);
    }
};
Another.cool();
console.log(Another.greeting); // "Hello World"
console.log(Another.count + 1); // 1（count 不是共享状态）

console.log(Something.count);